Use labels to understand a packaged food rather than reduce it to a good or bad score.
Understand the question
The listed serving size sets the basis for the nutrient information. Compare products on a consistent basis and consider what you actually plan to eat. A label is one information source; it does not describe the whole pattern of your meals.
Put it in everyday context
Two packages may use different serving sizes. Before comparing a nutrient number, check whether the amounts are comparable. If a clinician has given you a specific dietary target, ask how to apply it to the label rather than inventing a target yourself.
A comparison to avoid
Comparing numbers without noticing different serving sizes can create a misleading picture of the products.
Read the basis before the number
FDA explains that the listed serving size reflects typical consumption rather than a recommendation for how much you personally should eat. Nutrient amounts usually refer to one serving, and a package can contain several servings. Start with that basis before comparing products. [2]
Work through a simple arithmetic example
Suppose a fictional package lists 200 milligrams of sodium per serving and contains two servings. Eating both servings would provide 400 milligrams from that package. This arithmetic example explains the label basis; it does not establish an appropriate sodium target for you. When two products use different serving sizes, compare equivalent amounts or make clear that you are comparing the portions you plan to use.
Use percent Daily Value as a reference
As FDA’s general label-reading guide, 5 percent Daily Value or less is low and 20 percent or more is high for a nutrient per serving. These reference points do not turn a product into a complete personal dietary recommendation. Check the serving basis and the nutrients relevant to your question. An individualized dietary plan may require a different discussion with your clinician or dietitian. [2]
Choose a comparison that changes a decision
Before studying every number, name the actual decision: which product fits a meal, how the package will be divided, or how to discuss a prescribed dietary restriction. Compare the products on that basis. A label does not tell you whether a meal is enjoyable, affordable, practical to prepare, or compatible with a food allergy unless you check the relevant information. Keep the full context alongside the numbers rather than relying on a single good-or-bad score.
Your practical checklist
- Check serving size
- Compare equivalent amounts
- Review nutrients relevant to your needs
- Consider the meal context
Bring a focused question
How should I use this label with the dietary guidance I have received?
Save this question with your notes so the next conversation starts with the issue you want to understand.
Sources & further reading
Sources checked 2026-10-06. Links provide background on the topic; practical checklists are editorial planning suggestions. This guide has not received independent clinical review. Read our standards and disclosure.
